Fifth Wheel Hitch makes "popping" noise

[Vet4jdc]

I have a Pull-Rite 18k hitch mounted to industry standard rails in my 2017 F250 Super duty. This is NOT a slider. I have owned it for 4 years and it has always been very quiet when towing. Lately I am noticing that it is making these "popping" noises while towing. I have lubricated all of the moving parts and even sprayed WD40 on the pins connecting the hitch to the rails but nothing has fixed the problem. Any ideas?

[gearhead]

Call Pull Rite. I called them a couple times and they were helpful.

[Cbrez]

If you haven’t done so already, I would certainly check the bolt torque for the hitch and rail mounting brackets. I torque mine periodically and it’s not unusual to find a bolt or two that need tightening.